303.01.0021.01 DAF Compatible Relay Valve Repair Kit

What does a relay valve repair kit do?

This relay valve repair kit is designed to overhaul the relay valve, which is responsible for delivering balanced air pressure to the brake chambers in a heavy commercial vehicle's air brake system. By replacing internal components, this kit helps maintain the critical function of sensing pilot air and redirecting reservoir air to ensure rapid braking response.

Compatibility and vehicle fitment

This component is specifically compatible with DAF vehicles and is suitable for use with WABCO systems. It serves as a reliable solution for maintaining the pneumatic integrity of the braking circuit in heavy-duty applications.

Maintenance and installation

For workshop technicians, using a high-strength repair kit allows for the restoration of valve performance without requiring a complete unit replacement. When performing maintenance, ensure all ports are clear and check for any signs of diaphragm wear or seal degradation to prevent air leaks and ensure optimal braking timing.

Troubleshooting brake response

If you notice delays in brake application or audible air leaks from the valve housing, inspecting the internal seals and diaphragms is a recommended first step in troubleshooting.

OE cross-reference

303.01.0021.01 (Relay Valve Repair Kit Relay Valves) is the equivalent of the DAF and WABCO OE numbers. This part directly replaces DAF OE number 1297355. It also replaces WABCO OE number 9730110012.